Temperature indicator



Sept. 4, 1923. 1,466,887

0. w. MOORE TEMPERATURE INDI CATOR Filed Nov. 2, 1921 INVENTORI A TTORNEYS) Patented Sept. 4, 1923.

: .UNlTE D f STATES PATENT OFFICE.

' osoAn w. MOORE, or omoaeojrtnrnors.

TEMPERATURE INDICATOR.

' Application filed November 2, 1921; Serial No. 512,228.

To all whom it may concern: a

Be it known that I, OSCAR W. MOORE, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in Temperature Indicators, of Which the following is a specification.

This invention relates to temperature indicators of the class described in my copending application, Serial No. 502,099, filed September 1, 1921. The objects of the present invention are to provide a temperature indicator which may be readily read at a distance from the indicator, to simplify the operation, and reduce the number of parts in such indicating devices.

The objects of the invention are accomplished by the construction illustrated in the drawing, wherein Figure 1 is a front view of a temperature indicator constructed according to this invention.

Fig. 2 is a transverse vertical section taken on the line 2-2 of Figures 1 and 3.

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2.

Fig. 4 is an enlarged detail illustrating the construction of a spacing ring for eliminating any looseness of the face plates and covering crystals.

Fig. 5 is a detail of a thermostatically controlled pivoted indicating arm.

The principal elements of the construction illustrated are a ring-shaped casing having means for attachment to, for example, the ater jacket of an internal combustion engine, a pair of disk-shaped face plates covered by crystals and providing a space within the ring for the operating mechanism. These face plates are held apart by a resilient spacer, and on one of the face plates is a bracket for pivotally sup porting an indicating arm. This arm carries differently colored transparent disks, for example red and green, for respectively coming to view at circular sight openings in the face plates. This indicating arm has an inclined cam slot which is engaged by the end of a U-shaped thermostatic lamina mounted on the casing. The expansion of this thermostatic element causes the red disk to move more or less into view at the corresponding sight openings at the front and rear of the device. When intended for use in connection with internal combustion engines, the thermostatic element may be adjusted to show under normal engine operating conditions, equal amounts of red and green at the sight openings. If the cooling water is raised to nearly the boiling point, red would show over the entire face of the sight openings on one side, hereas the sight openings on the opposite side would remain clear. If the temperature falls to, for example, seventy degrees (70) Fahrenheit, or if desired to near the freezing point, the red disk would move out of view and the green would block vision through its respective sight openings.

Referring to the drawings, the ring-shaped casing 1 is shown provided with a threaded boss 2 into which is screwed a hollow supporting post 3. This post serves to enclose a U-shaped thermostatic element 1. This element is secured to'the casing by a screw 5, and its movable end terminates in a harddrawn brass ire 6, which is bent at right angles at its end 7 to engage an inclined slot 8 in an indicating arm 9. This arm is pivoted b a pin 10 to a bracket 11 secured to face p ate 12. Riveted to the ends of arm 9 are a transparent green disk 13 and a simi lar red disk 14. In Figure 3 the thermostatic element 4- is shown expanded so that the red disk 14 is between the sight openings 15 at one side of the face plates 12 and 16. When the indicating arm 9 is in the position shown by dotted lines in Fig. 3, the green and red disks show equally at their respective sight openings 17 and 15. This may represent the temperature of the cooling water under normal operating conditions of the engine. When the red disk is out of view, but the green disk blocks vision through the sight opening 17, such indication represents that the cooling water is cold.

The two face plates 12 and 16 bear against the edges of a ring-shaped spacer 18. This spacer has a resilient inturned edge 19 so that after the face plates and crystals 20 are assembled in the casing 1, these will be forced outwardly so that the crystals bear against their retaining rings 21. By this means any tendency toward looseness or rattle in the structure is eliminated.

In the operation of the device, with the red disk 14 concentric with the center of the sight openings 15, the indication reprei; causing its arm which engages the' indi cator 9 to 051m the indicatoi' over, moving ;the red disk downwardly and the greendisk upwardly more or less into 'view at its sight openings '17. i

the" spirit of this invention as defined by the -0110wingv "claim. 7

I I claim A temperature indicator Comprising a'disk' shaped casing; each faceofthe'easingbeing' p'i'ovided with a pair at "sight opehin-g's an arm so pivoted in said casing between said sight openings that while one end 'of-the arm may move muster i'ess into view in one sight opening the other end of the arm will move to a. Coi'ie'sjoonding extent out of view at the other sight opening said arm being pro vided with a slot, and thermostatic means for engaging the arm 'atisaid slotfof the purpose 'of i'ooking the'atrm.

Signed at Chicago this 31st day of Oe'tos A her, 1921. e.

' OSCARPW. 

